bfs_visitor<EventVisitorList>

This class is an adapter that converts a list of EventVisitor's (constructed using
std::pair) into a BFSVisitor.

Example

This is an excerpt from examples/bfs.cpp where three
event-visitors are combined to make a BFS visitor. The functions
boost::record_distances, boost::record_predecessors,
and copy_graph are all functions that create an event
visitor.